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8. If the amount of heat given to a system be 35 joules and the amount of work done by the system be -15 joules

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8. If the amount of heat given to a system be 35 joules and the amount of work done by the system be -15 joules, then the change in the internal energy of the system is

(a) -50 joules       (b) 20 joules (c) 30 joules        (d) 50 joules Ans. d (10)
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